Kingston, John
Longman ; York Press, 1992
Buku Referensi
McGraw-Hill, 1994
Buku Teks
Skousen, Philip L.
McGraw-Hill, 2011
Buku Teks
edited by Martyn V. Twigg
Wolfe Publishing, 1989
Buku Referensi
edited by E.U. Condon and Hugh Odishaw
McGraw-Hill, 1967
Buku Referensi